Measurement Computing eZ-Balance rev.9.0 User Manual
Page 25
eZ-Balance
969391
Windows, Buttons, and Menus 3-7
Configuration Menu . . . Analyzer Tab
Panel
Function(s)
Hardware
This panel consists of a pull-down list from which you must select your data
acquisition hardware, for example, 600 Series, ZonicBook/618E, or a
WaveBook/516 series device with a WBK14 or WBK18.
Low Frequency
Cutoff Hz
This panel allows you to set values for: No, Single, and Double Integration. Low
frequency cutoff is used to remove the low frequency effects of integration. All
spectral amplitude values below the specified frequency value are set to zero.
Filter
Used to set the High Pass (AC Coupling Filter) to 0.1 Hz or to 1.0 Hz. Note that
coupling is set to AC or DC in the Input Channels tab. Select 1.0 Hz for machines
with RPM > 300.
Analyzer Setup
This panel is located on the right-side of the Balance Configuration tab.
It includes pull-down lists for the following items:
Spectral
Lines
The number of lines per spectrum and the number of data samples used in the FFT
(Fast Fourier Transform) process. The more spectral lines, the greater the data
resolution. As the number of spectral lines increases, so does the time that it takes
to collect the data and the amount of disk space.
Analysis
Frequency
(Hz)
This value is the maximum frequency of interest. The sampling rate will be 2.56
times the analysis frequency. Verify the maximum frequency response of your
probes. Typically, the analysis frequency will be 5x the Machine’s Rotating
Speed.
Number of
Averages
The averaging function is a rolling buffer that averages the last “n” data blocks.
The typical number of averages is 5.
FFT
Window
Options are None, Hanning, Flat Top, or Blackman Harris. Hanning provides
better frequency resolution. Flat Top provides better amplitude resolution.
No. Balance
Planes
eZ-Balance can have between 1 and 7 balance planes, up to the number of response
inputs.
The lower right section of the Analyzer Setup tab includes a note which states:
Valid RPM Range
Acquisition Time (for 1 block)
Acquisition Time (weighted average)
Frequency Resolution